Electrical cooking apparatus.



No. 726,241. I PATENTB-D APR. 28, 1903.

J. I. AYER.

ELECTRICAL COOKING APPARATUS. v

APPLICATION FILED SEPT. 10, 1900.

2 SHEETS-SHEET L N0 HODEL.

PATENTED APR. 2a, 1903.

J. I. AYER. ELECTRICAL COOKING APPARATUS.

APPIJIOATION FILED SEPT. 10, 1900.

2 SHEETS-SHEET 2.

10 MODEL.

\X/ITHESEEEIZ UNITED STATES PATENT OFFICE.

JAMES I. AYER, OF MALDEN, MASSACHUSETTS, ASSIGNORTO THE SIMPLEXELECTRICAL COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OFMASSACHUSETTS.

ELECTRICAL COOKING APPARATUS.

SPECIFICATION forming part Of Letters Patent NO. 726,241, dated. April28, 1903. Application filed September 10. 1900 Serial No. 29,529. (Nomodel.)

To a whom it may concern.-

Be it known thatI, JAMES LAYER, a citizen of the United States ofAmerica, and a resident of Malden, county of Middlesex, and State ofMassachusetts, have invented certain new and useful Improvements inElectrical Cooking Apparatus, of which the following is a specification.

This invention consists in an improvement in the construction ofutensils adapted for use with electrically-heated stoves or withelectroheating-stands, which are in effect small stoves.

The economy in the use of electroheating for domestic and culinarypurposes resides largely in the promptness with which the full heatrequired is turned on and off and is communicated to the utensil and tothe contents thereof. Imperfect heat-conductive contact between theelectroheater and the utensil seriously interferes with economicaloperation of the heater, for the reason that the time required to heator cook the contents of the utensil is very materially protracted. Itis, moreover, of importance to provide utensils which may be as readilyplaced upon and removed from the stove as in the-case of the ordinarycoal or gas stoves, and therefore any device which though efficient inproducing heat-conductive contact between the utensil and heater isnevertheless complicated or slow in operation will be inadequate to meetpractical requirements. 7

My invention herein described provides means by which utensils can bequickly and efficiently clamped to the electroheating-surface of anelectric stove and can be removed therefrom with equal promptness.

In the drawings which illustrate an em-. bodiment of myinvention, Figurelis a view in perspective of the bottom of a kettle with myimprovementillustrated thereon. Fig. 2 is the cylindrical heater-block nowextensively used in electroheating-stoves with an attachment thereonadapting it to cooperate with my improved utensil. Fig. 3 shows a planView of the top of the heating-block of Fig. 2 and the bottom of thekettle or like utensil of Fig. 1. Fig. Lshows a vertical longitudinalsection of a saucepan with my improvements illustrated, and Fig. 5 showsin cross-section three details of flanged joints adapted to the purposesof a utensil equipped with my improvement.

The heating elements of an electric stove consist usually of individualheaters Wherein the heating resistances areinclosed in cylindricalcast-iron blocks, such asillustrated at A in Figs. 2 and Upon theseblocks are placed the utensils to be heated. The time required toaccomplish the work of heating or cooking is greatly reduced when theintimacy and pressure contact between the bottom of the utensil and topof the heater are increased. In order to enable the person using such aheater to establish and maintain a desirable pressure between the heaterand utensil, I providethe following devices, which embody my invention.

Secured to or formed integral with the body B of the utensil abase-flange C is provided, which descends a suitable distance below thebottom G. The internaldiameter of the basefiange C is larger than thatof the heaterblock A, and upon the inside of the flange C I form orsecure two projections D, preferably diametrically opposite to eachother. These projections D form one member of a binding-joint and, asshown in Fig. 4, are slightly inclined for a purpose presently to bedescribed. 1 form upon or secure to the heaterblock A projections E,which constitute the other members of the binding-joint and are adaptedto cooperate with the projections D.

In order to insure the proper centering of the utensil upon thebeater-block, I provide also the centering-blocks E, which in theillustration shown are secured to the inner side of the base-flange C.These centering-blocks F are preferably placed opposite each other, sothat the distance between their inner faces is practically the same asthe diameter of the heater-block A. The binding-joint members D are alsopreferably of such proportions that when the utensil is placed upon theheaterblock they will make a comfortable sliding fit therewith.

In order to place and secure the utensil upon the heater-block, all theperson in charge is required to do is to place the utensil upon theblock in the ordinary manner, allowing the binding-joint members D andcenteringblocks F to find their Way over the side of the heater-block A.Then upon giving the utensil a turn (as in the case shown, a turn to theright) the binding-joint members D and E engage with each other and byreason of the inclination or bevel given to the member D in engagementwith the binding-joint draw the utensil tightly down on theheater-block, so that the bottom G of the utensil and top A of theheater-block are brought intimately into contact. Before removing theutensil a slight turn to the right is all thatis necessary to free theengagement of the binding-joint.

The result of employing this my invention is that in any given case thetime required to raise the contents of the utensil to the desiredtemperature is from one-half to three-fourths the time required When theutensil is merely placed upon the surface of the heater.

In Figs. 4 and 5 I have indicated several forms of flange andflange-joints which I have found will serve the purposes of utensils towhich the invention above described is applied.

What I claim, and desire to secure by Let ters Patent, is

An electrical cooking apparatus, comprising a cooking utensil and anelectric heating device, provided respectively with heat-transmittingsurfaces adapted to contact at every point throughout their adjacentareas, said cooking utensil at its lower peripheral edge being providedwith an endless depending base flange having an internal diameterslightly larger than that of the heating device, said base-flangeflaring slightly and being imperforate, and having substantially thesame depth throughoutits entire extent, said heating device and saidbase-flange on their contiguous surfaces having cooperating pins andobliquely-arranged binding -joint members for detachably Wedging thecooking utensil and heating device together upon relatively rotarymovement, substantially as described.

Signed by me at Boston, Massachusetts, this 23d day of August, 1900.

JAS. I. AYER.

Witnesses:

FRANK S. HARTNETT, ROBERT OUsHMAN.

